McInnis, a former Congressman, is viewed very favorably by 14 percent of those poll, while eight percent see him unfavorably. Sixteen percent have no opinion.

Denver mayor Hickenlooper is viewed very favorably by 27 percent and unfavorably by 18 percent. Another 17 percent have no opinion.

Earlier this week, McInnis refused to commit to releasing his tax returns. The poll found that 73 percent of the voters believe all candidates running for public office should make their returns public.